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Home >> Jeep >> 2018 >> Wrangler JK Sahara, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1638-TCM Internal-Can 1 Ram Performance >> Set Condition
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Set Condition

If the TCM detects an internal error with the controllers Random Access Memory (RAM) on the CAN controller 1 section of the microprocessor.

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